Heat Transfer
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

Passes through a maxima
Remains constant
Decreases
Increases

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Heat Transfer
In sub-cooled boiling,

Very large vapour space is necessary
Temperature of the heating surface is less than the boiling point of the liquid
Temperature of the heating surface is more than the boiling point of the liquid
Bubbles from heating surface are absorbed by the mass of the liquid

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